Add initial rabbitmq docs

rabbitmq/README-short.txt

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+RabbitMQ is a highly reliable enterprise messaging system based on the emerging AMQP standard

rabbitmq/content.md

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+# What is RabbitMQ?
+
+RabbitMQ is open source message broker software (sometimes called
+message-oriented middleware) that implements the Advanced Message Queuing
+Protocol (AMQP). The RabbitMQ server is written in the Erlang programming
+language and is built on the Open Telecom Platform framework for clustering and
+failover. Client libraries to interface with the broker are available for all
+major programming languages.
+
+> [wikipedia.org/wiki/RabbitMQ](https://en.wikipedia.org/wiki/RabbitMQ)
+
+%%LOGO%%
+
+# How to use this image
+
+## Running the daemon
+
+One of the important things to note about RabbitMQ is that it stores data based
+on what it calls the "Node Name", which defaults to the hostname.  What this
+means for usage in Docker is that we should either specify `-h`/`--hostname` or
+`-e RABBITMQ_NODENAME=...` explicitly for each daemon so that we don't get a
+random hostname and can keep track of our data:
+
+    docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit rabbitmq:3
+
+If you give that a minute, then do `docker logs some-rabbit`, you'll see in the
+output a block similar to:
+
+    =INFO REPORT==== 31-Dec-2014::23:21:09 ===
+    node           : my-rabbit@988c28b0eb2e
+    home dir       : /var/lib/rabbitmq
+    config file(s) : /etc/rabbitmq/rabbitmq.config (not found)
+    cookie hash    : IFQiLgiJ4goGJrdsLJvN7A==
+    log            : undefined
+    sasl log       : undefined
+    database dir   : /var/lib/rabbitmq/mnesia/my-rabbit
+
+Note the `database dir` there, especially that it has my `RABBITMQ_NODENAME`
+appended to the end for the file storage.  This image makes all of
+`/var/lib/rabbitmq` a volume by default.
+
+### Management Plugin
+
+There is a second set of tags provided with the [management
+plugin](https://www.rabbitmq.com/management.html) installed and enabled by
+default, which is available on the standard management port of 15672, with the
+default username and password of `guest` / `guest`:
+
+    docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit rabbitmq:3-management
+
+You can access it by visiting `http://container-ip:15672` in a browser or, if
+you need access outside the host, on port 8080:
+
+    docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit -p 8080:15672 rabbitmq:3-management
+
+You can then go to `http://localhost:8080` or `http://host-ip:8080` in a
+browser.
+
+## Connecting to the daemon
+
+    docker run --name some-app --link some-rabbit:rabbit -d application-that-uses-rabbitmq

rabbitmq/license.md

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+View [license information](https://www.rabbitmq.com/mpl.html) for the software
+contained in this image.